Help plz. P

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Why does his teacher ask him to balance the equation by including the correct coefficient

Identify the electromagnets with poles that are reversed from the electromagnet shown above